Basic Study on the Effect of Water Sprinkling Curing Immediately after Demolding on the Initial Strength of Steam Cured Mortars

Abstract:

Steam curing is generally applied to improve productivity of precast concrete products. After steam curing, the products are stored outdoors as a secondary curing process until shipment. However, drying shrinkage and expansion of microcracks that occur during steam curing may inhibit strength improvement. On the other hand, water curing is also clearly effective as a secondary curing process. However, installing a water curing pool in a precast concrete plant is not easy due to limited space. Therefore, we focused on water sprinkling curing, which is relatively easy to perform without such restrictions. In this study, the effects of water sprinkling curing on the physical properties of mortar at the early age of steam curing were studied from the aspects of materials, mix proportions, curing conditions, and temperature of water used for sprinkling curing. As a result, it was confirmed that water sprinkling curing at an early age after demolding resulted in a rapid decrease in the temperature of the mortar surface layer. However, it was confirmed that the same conditions were effective in increasing compressive strength.

• Periodical: Materials Science Forum (Volume 1084)
• Pages: 131-137
• DOI: https://doi.org/10.4028/p-0msj77
• Online since: April 2023
• Authors: Tsubasa Sato*, Nana Katsuoka, Yoshiki Uno, Shigeyuki Date
• Keywords: Compressive Strength, Concrete, Curing, Precast Concrete, Water Sprinkling Curing

References

[1] V. Rostami et al: Carbonation Curing versus Steam Curing for Precast Concrete Production, Journal of Materials in Civil Engineering, pp.1221-1229, (2012)

DOI: 10.1061/(asce)mt.1943-5533.0000462

[2] Kunlin Ma, et al: A real case of steam-cured concrete track slab premature deterioration due to ASR and DEF, Case Studies in Construction Materials, Vol,6 June 2017, Pages 63-71

DOI: 10.1016/j.cscm.2016.12.001

[3] Koji OTSUKA, et al: Properties of microcracks formed on the surface of the concrete at steam curing period, Japan Society of Civil Engineers, No.520/V-28,143-155,1995.8

DOI: 10.2208/jscej.1995.520_143

[4] Xiaofeng Han et al: Volume Deformation of Steam-Cured Concrete with Slag during and after Steam Curing, Materials 2021, 14, 1647

DOI: 10.3390/ma14071647

[5] K.Maruyama et al: Study on Strength Characteristics and Pore Structure of Concrete Products under Different Steam Curing Conditions, Proceedings of the Japan Concrete Institute, Vol. 33, No. 2, pp.571-576, (2011)

[6] Q.Huang et al: Early-Age Shrinkage Effects In Precast Concrete Sandwich Panels, Precast/Prestressed Concrete Institute Journal, Vol. 65, pp.74-88, (2020)

DOI: 10.15554/pcij65.1-04

[7] A.Terakawa et al: Effect of curing conditions on pore structure of precast concrete products, Proceedings of the Japan Concrete Institute, Vol. 34, No. 2, (2012)

[8] T.Sawamoto et al: Effect of mix and initial wet curing period on strength development of concrete, Vol.67, No.1, pp.311-317, (2013)

[9] Tomoko Ishida, et al: Water sprinkling curing and heat insulation curing on thermal cracking of wall shaped structures. (In Japanese)

[10] apan Concrete Institute, Vol. 2, No. 30, pp.163-168, (2008) Japanese Standards Association: JIS R 5201, Physical Test Methods for Cement, (2015)

[11] Songhee Lee, et al: Optimization of Curing Regimes for Precast Prestressed Members with Early-Strength Concrete, International Journal of Concrete Structures and Materials Vol.10, No.3, p.257–269, September 2016Authors' background

DOI: 10.1007/s40069-016-0154-7

[12] Jin-Keun Kim, et al: Hydration and Thermal Stress in Concrete Structures, The 2013 World Congress on Advances in Structural Engineering and Mechanics (ASEM13) Jeju, Korea, September 8-12, (2013)